package com.zq.zqmall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zq.common.utils.PageUtils;
import com.zq.common.utils.Query;

import com.zq.zqmall.product.dao.CategoryDao;
import com.zq.zqmall.product.entity.CategoryEntity;
import com.zq.zqmall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1.查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //2.组装成树形结构
        //2.1级分类
        List<CategoryEntity> rootMenus = entities.stream()
                .filter(categoryEntity -> categoryEntity.getParentCid() == 0)
                .map((menu)->{
                    menu.setChildren(getChildren(menu, entities));
                    return menu;
                }).sorted((menu1,menu2)->{
                    return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
                }).collect(Collectors.toList());
        return rootMenus;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 检查当前要删除的菜单是否有关联。

        //通过配置改为逻辑删除
        baseMapper.deleteBatchIds(asList);
    }

    //递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildren(CategoryEntity root, List<CategoryEntity> allList){
        List<CategoryEntity> children = allList.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            categoryEntity.setChildren((getChildren(categoryEntity, allList)));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());

        }).collect(Collectors.toList());

        return children;
    }

}